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Unfortunately, I know of no definitive list that states which herbs are toxic to cats. And, also unfortunately studies done on humans and dogs are not useful as cats are a completely different breed (pardon the pun) whose metabolism does not compare. What might be better is to look at those herbs traditionally used with cats. Information such as this may be found in Juliette de Bairacli Levy’s works: "Cats Naturally" and "The Complete Herbal handbook for the Dog and Cat".